/* ---------- Colors (light + dark) ---------- */
:root {
  --bg: #fbfaf7;
  --text: #1c1c1e;
  --muted: #66645f;
  --accent: #0b4f8a;
  --accent-soft: rgba(11, 79, 138, 0.08);
  --rule: #e3e0d8;
  --tiling: rgba(11, 79, 138, 0.24);
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141517;
    --text: #e6e4df;
    --muted: #9b9891;
    --accent: #86b7e8;
    --accent-soft: rgba(134, 183, 232, 0.1);
    --rule: #2b2d31;
    --tiling: rgba(134, 183, 232, 0.18);
  }
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--serif);
  font-size: 1.125rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 46rem;
  margin: 0 auto;
  padding: 0 1rem;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 0.15em; }

h1, h2, h3 { font-weight: 600; line-height: 1.25; }
h2 {
  font-size: 1.3rem;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--rule);
}
h3 { font-size: 1.1rem; margin: 1.75rem 0 0.5rem; }

img { max-width: 100%; height: auto; }

hr { border: 0; border-top: 1px solid var(--rule); margin: 2rem 0; }

blockquote {
  margin: 1.5rem 0;
  padding-left: 1rem;
  border-left: 3px solid var(--rule);
  color: var(--muted);
}

code {
  font-size: 0.9em;
  background: var(--accent-soft);
  padding: 0.1em 0.3em;
  border-radius: 3px;
}

/* ---------- Hyperbolic background ---------- */
#hyperbolic-bg {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
  transition: opacity 0.25s ease;
}
.tiling-label {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--bg);
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.8rem;
  opacity: 0;
  transform: translateY(0.4rem);
  transition: opacity 0.3s ease, transform 0.3s ease;
  pointer-events: none;
}
.tiling-label.show { opacity: 1; transform: none; }

/* ---------- Header / footer ---------- */
.site-header { border-bottom: 1px solid var(--rule); }
.site-header .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-top: 1.25rem;
  padding-bottom: 1rem;
}
.site-name {
  color: var(--text);
  font-weight: 600;
  font-size: 1.15rem;
}
.site-name:hover { text-decoration: none; }
.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.1rem;
  font-family: var(--sans);
  font-size: 0.9rem;
}
.site-nav a { color: var(--muted); }
.site-nav a:hover { color: var(--accent); text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--text); font-weight: 600; }

main { padding-top: 2rem; padding-bottom: 3rem; }

.site-footer {
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.8rem;
  padding: 1.25rem 0 2rem;
}

.page-title { font-size: 1.9rem; margin: 0 0 1.5rem; }

/* ---------- About ---------- */
.intro {
  display: grid;
  grid-template-columns: 11rem 1fr;
  gap: 2rem;
  align-items: start;
}
.intro-photo img {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 50%;
}
.intro-name { font-size: 1.9rem; margin: 0; }
.intro-role { margin: 0.25rem 0 0; color: var(--muted); }
.intro-role a { color: inherit; }
.intro-role a:hover { color: var(--accent); }
.links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  margin: 0.9rem 0 0;
  padding: 0;
  list-style: none;
  font-family: var(--sans);
  font-size: 0.9rem;
}
@media (max-width: 600px) {
  .intro { grid-template-columns: 1fr; gap: 1.25rem; }
  .intro-photo { width: 9rem; }
}

/* ---------- Lists of entries (publications, talks, ...) ---------- */
.entries { list-style: none; margin: 0; padding: 0; }
.entry {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 1rem;
  padding: 0.55rem 0;
}
.entry-date {
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.85rem;
  padding-top: 0.2rem;
  white-space: nowrap;
}
.entry-title { font-weight: 600; }
.entry-detail { color: var(--muted); }
.entry p { margin: 0.15rem 0 0; }
.entry-links {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.5rem;
  margin-left: 0.15rem;
  font-family: var(--sans);
  font-size: 0.8rem;
  vertical-align: 0.1em;
}
.entry-links a {
  padding: 0.05rem 0.45rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
}
.entry-links a:hover { background: var(--accent-soft); text-decoration: none; }
@media (max-width: 600px) {
  .entry { grid-template-columns: 1fr; gap: 0; }
}

.pubs { margin: 0; padding-left: 1.5rem; }
.pubs li { padding: 0.45rem 0; }
.pubs li::marker { color: var(--muted); font-family: var(--sans); font-size: 0.85rem; }

.tag {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.75rem;
  color: var(--muted);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 0 0.45rem;
  vertical-align: 0.1em;
}

/* ---------- Teaching ---------- */
.course { padding: 0.55rem 0; }
.course-title { font-weight: 600; }
.course p { margin: 0.1rem 0 0; color: var(--muted); }
.materials-box {
  margin: 0.5rem 0 0.25rem;
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 0.45rem 0.8rem;
}
.materials-box summary {
  cursor: pointer;
  font-family: var(--sans);
  font-size: 0.9rem;
  color: var(--text);
}
.materials-box summary .count { color: var(--muted); font-size: 0.8rem; margin-left: 0.3rem; }
.materials-box[open] summary { margin-bottom: 0.35rem; }
.materials {
  margin: 0;
  padding-left: 1.2rem;
  columns: 2 15rem;
  column-gap: 2rem;
}
.materials li { padding: 0.1rem 0; break-inside: avoid; }

/* ---------- Blog ---------- */
.post-list { list-style: none; margin: 0; padding: 0; }
.post-list li { padding: 0.8rem 0; border-bottom: 1px solid var(--rule); }
.post-list li:last-child { border-bottom: 0; }
.post-list .post-link { font-weight: 600; font-size: 1.15rem; }
.post-list p { margin: 0.2rem 0 0; color: var(--muted); }
.post-meta {
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.85rem;
  margin: 0 0 0.4rem;
}
.post .page-title { margin-bottom: 1.5rem; }
.empty { color: var(--muted); font-style: italic; }

@media (max-width: 600px) {
  body { font-size: 1.05rem; }
  .site-nav { gap: 0.25rem 0.9rem; font-size: 0.85rem; }
  .page-title, .intro-name { font-size: 1.6rem; }
}

/* ---------- Gallery ---------- */
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(13rem, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}
.gallery figure { margin: 0; }
.gallery img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--rule);
}
.gallery figcaption {
  margin-top: 0.4rem;
  font-size: 0.9rem;
  line-height: 1.4;
}
.gallery-date { color: var(--muted); }